US 11,053,652 B2
Two-wire controlling and monitoring system for in particular irrigation of localized areas of soil
Tom Nohr Christiansen, Horsholm (DK)
Assigned to S-RAIN CONTROL A/S, Kvistgard (DK)
Filed by S-RAIN CONTROL A/S, Kvistgard (DK)
Filed on Oct. 3, 2018, as Appl. No. 16/151,084.
Application 16/151,084 is a division of application No. 14/404,837, granted, now 10,113,287, previously published as PCT/EP2013/061239, filed on May 31, 2013.
Claims priority of application No. 12170174 (EP), filed on May 31, 2012; application No. 13151061 (EP), filed on May 31, 2012; application No. 13151075 (EP), filed on May 31, 2012; application No. 13151081 (EP), filed on May 31, 2012; and application No. 13151083 (EP), filed on May 31, 2012.
Prior Publication US 2019/0032294 A1, Jan. 31, 2019
Int. Cl. E02B 13/02 (2006.01); A01G 25/16 (2006.01); G01R 31/327 (2006.01); E02B 5/08 (2006.01); G01R 27/02 (2006.01); H01F 7/18 (2006.01)
CPC E02B 13/02 (2013.01) [A01G 25/16 (2013.01); A01G 25/167 (2013.01); E02B 5/082 (2013.01); G01R 27/02 (2013.01); G01R 31/3278 (2013.01); H01F 7/1805 (2013.01); H01F 7/1844 (2013.01); H01F 7/1877 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for controlling and monitoring irrigation of localized areas of soil, the method comprising the steps of:
providing a water pipeline providing water to the localized areas of soil;
providing a plurality of controllable irrigation valves, each of the controllable irrigation valves being positioned at a specific area of the localized areas of soil, each of the controllable irrigation valves being connected to the water pipeline for providing watering or non-watering of the specific area of the localized areas of soil, and each of the controllable irrigation valves having a pair of valve control inputs;
providing a plurality of localized irrigation control units, each of the localized irrigation control units comprising a line decoder having a pair of valve control outputs connected to the pair of valve control inputs of a specific controllable irrigation valve of the plurality of controllable irrigation valves for providing valve control signals to the plurality of controllable irrigation valves, each of the line decoders having a pair of control and power supply inputs configured for communicating with a controller and power supply unit over a two-wire cable, the specific controllable irrigation valve of the plurality of controllable irrigation valves comprising (a) a solenoid connected to the valve control inputs, (b) a core operable between a first position and a second position, and (c) a piston connected to the core;
defining in each of the line decoders an inrush DC voltage level signal for forcing the core into the second position;
defining in each of the line decoders a hold DC voltage level signal for retaining the core in the second position;
determining, by means of the line decoders, which of the first position and the second position the core is in;
measuring a self-inductance value and a resistance value of the solenoid;
transmitting, by means of the line decoders, the measured self-inductance value and the measured resistance value to the controller and power supply unit via the two-wire cable, wherein, in response to an increase in the measured resistance value and the measured self-inductance value, the controller and power supply unit determines that the solenoid has degenerated, and wherein, in response to an increase in the measured resistance value with an unchanged measured self-inductance value, the controller and power supply unit determines a likely connection fault between the localized irrigation control unit and the solenoid.